Tester for electric blasting-fuses.



I. BEATTIB.

TESTER FOR ELECTRIC BLASTING FUSES.

I APPLICATION FILED FEB. 23,1909.

Patented May 3, 1910.

' fuse.

in testers for electric blastin In blasting with electric fuses if the blast To all whom 'it may concern:

FRANCIS BEA'ITIE, OF LEETE ISLAND, CONNECTICUT.

Specification of Letters Patent.

Application filed February'23, 1809. Serial No. 479,424.

TESTER FOR ELECTRIC BLA STING-FUSES.

Patented May 3, 1910.

,Be it known that I, FRANCIS BEA'ITIE, a citizen of the United States, residing at Leete Island in-thecounty of New Haven and State of Connecticut, have invented a new and useful Im rovement in Testers for Electric Blastinguses; 'and I do hereby declare the following, when taken in connection with the accompanying drawings and the numerals of reference marked thereon, to be a full, clear, and exact description of the same and which said drawings constitute part of this specification, and represent, in-

Fi re 1 a top or Ian view of a tester for e ectric blastin fuses shown partly in section, and with t e cover open. 2 a top or plan view with the cover clos and shownconnected with an electric blasting Fig. 3 a broken sectional view showinfismeansfor holding one of the battery co in position.

This invention relates to an improvement fuses.

in eachchamber does not 0 off, there is no way to tellwhether it-was eeause the wires between the battery and the .powder were crossed, or whether owing to a fissure'in the rock the powder has run.

The object of this invention is to rovide a' testin device including an electric light by whic these fuses ma be tested, and so that it can be determine whether the difiiculty is with the wire or not; and the invention consists in the construction hereinafter fym g ass 5. In the box for convenience I- em oy batteries which come in short cells an use three of such cells 6, 7 and 8. These cells eachhavea fiat base 9 and a plug or oint 10. The cells 6 and .7 are arranged in line so that the plug of one bears against the base of the other. In the end of the box adjacent to the end of the cell 6 is a screw 0st 11 with which the cell 6 is in contact. ounted near the center of the box is a which the end of t e cell 8 rests. in the end 14 of the box are two plungers 15 'the cell 7 and the en and 20, and the plugs are connecte bracket an V of batteries opposite said light and battery% bracket 12 carryin a screw post 13 against Mounted and 16. These plungers have washers 17 and 18 which bear a ainst the point 10 of of cell 8 and are held in contact therewith by spiral springs 19 together by a metal late 21 so that the cells are connected in t e same circuit. These spring plungers rmit the read removal of the several cefi: when require The ost 1-3 is connected with an incandescent l1 ht bulb 22 and this light bulb is connecte with a binding post 23 mounted in the end 24 of the box. In order to test the fuse the wires 25 and 26 thereof are coupled respectively with the binding osts 11 and 23, and if when connected t e incandescent bulb is lighted it shows immediately that the cap 1s perfect; or if there is no light, it indicates that the cap is imperfect or as been exploded. I

This device is very simple in construction and so small that it may be'readil carried about and the battery cells replace at will; and the current assing through the incandescent bulb is 0 such ow amperage that it will not explode the cap.

I claim A tester for electric blastin prising a box, a bracket in sai box, a battery cell between said bracket' and one end of the box an electric lamp between said (i the other end of said box, a pair connections for the batteries at one end 0 the box, and binding posts at the op osite end in connection with said light an batteries whereby when the circuit is closed, said amp will be lighted and the electric current regulated.

fuses com- I In testimony whereof, 'I have signed this specification in the presence of two subscribing witnesses.

FRANCIS BEATTIE.

Witnesses:

. Fmmmmo C. EARLE,

CLARA L. WEED. 

